openstack: make scenario able to reuse clients

Make rally.plugins.openstack.OpenStackScenario respect `admin_clients` and
`clients` kwargs so the pre-existing clients can be reused.

Change-Id: Ie93880b06ace24074a97802ab2c905622d2654e2

rally/plugins/openstack/scenario.py

@@ -20,7 +20,7 @@ from rally.task.scenarios import base
 class OpenStackScenario(base.Scenario):
     """Base class for all OpenStack scenarios."""
 
-    def __init__(self, context=None):
+    def __init__(self, context=None, admin_clients=None, clients=None):
         super(OpenStackScenario, self).__init__(context)
         if context:
             if "admin" in context:
@@ -28,6 +28,18 @@ class OpenStackScenario(base.Scenario):
                     context["admin"]["endpoint"])
             if "user" in context:
                 self._clients = osclients.Clients(context["user"]["endpoint"])
+        if admin_clients:
+            if hasattr(self, "_admin_clients"):
+                raise ValueError(
+                    "Only one of context[\"admin\"] or admin_clients"
+                    " must be supplied")
+            self._admin_clients = admin_clients
+        if clients:
+            if hasattr(self, "_clients"):
+                raise ValueError(
+                    "Only one of context[\"user\"] or clients"
+                    " must be supplied")
+            self._clients = clients
 
     def clients(self, client_type, version=None):
         """Returns a python openstack client of the requested type.

tests/unit/plugins/openstack/test_scenario.py

@@ -0,0 +1,76 @@
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import mock
+from oslotest import mockpatch
+
+from rally.plugins.openstack import scenario as base_scenario
+from tests.unit import test
+
+
+class OpenStackScenarioTestCase(test.TestCase):
+    def setUp(self):
+        super(OpenStackScenarioTestCase, self).setUp()
+        self.osclients = mockpatch.Patch(
+            "rally.osclients.Clients")
+        self.useFixture(self.osclients)
+
+    def test_init(self):
+        context = {"foo": "bar"}
+        scenario = base_scenario.OpenStackScenario(context)
+        self.assertEqual(context, scenario.context)
+
+    def test_init_admin_context(self):
+        context = {
+            "foo": "bar",
+            "admin": {"endpoint": mock.Mock()}
+        }
+        scenario = base_scenario.OpenStackScenario(context)
+        self.assertEqual(context, scenario.context)
+        self.osclients.mock.assert_called_once_with(
+            context["admin"]["endpoint"])
+
+        self.assertRaises(
+            ValueError, base_scenario.OpenStackScenario,
+            context, admin_clients="foobar")
+
+    def test_init_admin_clients(self):
+        context = {"foo": "bar"}
+        scenario = base_scenario.OpenStackScenario(
+            context, admin_clients="foobar")
+        self.assertEqual(context, scenario.context)
+
+        self.assertEqual("foobar", scenario._admin_clients)
+
+    def test_init_user_context(self):
+        context = {
+            "foo": "bar",
+            "user": {"endpoint": mock.Mock()}
+        }
+        scenario = base_scenario.OpenStackScenario(context)
+        self.assertEqual(context, scenario.context)
+        self.osclients.mock.assert_called_once_with(
+            context["user"]["endpoint"])
+
+        self.assertRaises(
+            ValueError, base_scenario.OpenStackScenario,
+            context, clients="foobar")
+
+    def test_init_user_clients(self):
+        context = {"foo": "bar"}
+        scenario = base_scenario.OpenStackScenario(
+            context, clients="foobar")
+        self.assertEqual(context, scenario.context)
+
+        self.assertEqual("foobar", scenario._clients)